python - Pandas: How to delete string with some value -

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i have df

              subdomain search_engine search_term   0                    vk.com          none        none   1                    vk.com          none        none   2              facebook.com          none        none   3                    vk.com          none        none   4                    vk.com          none        vkontakte

i need 4 vk.com none vkontakte

i try 

df[~df.search_term.str == r"none"]

but returns typeerror: bad operand type unary ~: 'stringmethods'

i think should it:

in[75]:df[df.search_term.str.strip()!='none'] out[75]:    subdomain search_engine search_term 4    vk.com          none   vkontakte

or work:

df[~df.search_term.str.match('none')]

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